This Google Maps hack is both informative and chilling: “HYDESim maps overpressure radii generated by a ground-level detonation; these radii are an indicator of structural damage to buildings.” In other words, it overlays the blast radius of a nuclear-grade explosion on a location displayed by Google Maps (it defaults to a 100-kiloton blast over Manhattan). Very well done, with many configurations and explanations. Via Boing Boing.